Material: The chain guide tensioner is made of A3 steel, iron and plastic, well made, high hardness, strong and , not easy to rust and aging. Pulley chain adjuster: Effectively adjust the chain tension, prevent the chain from popping out and biting when rotating, reduce wear and extend the service life of the chain. Easy to install: No complicated steps, can be quickly installed to the beach bike chain, easy to operate, save time and effort, easy to use. Automatic Adjustment: No need to check or adjust the chain loose caused by other reasons, you can adjust the chain automatically to avoid manual adjustment. Applicable models: The beach bike chain tensioner is compatible for ATV 110/125/150/200/250CC models, which is an ideal chain adjustment tool. Product name:Off-road beach bike chain tensioner Size about:Length 12.5cm/4.9 inch Weight about: 250g/98 OZ Color:Red & Black Material:Metal+Plastic Package Contents: 1 * Chain tensioner kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.